Correlation between the entropy of the envelope fluctuations of a UHF radio signal and the corresponding thermodynamic stability of the tropospheric common volume

This correlation as derived by experiment is discussed. The considered system is not in general thermodynamically closed and the parameters involved do not necessarily satisfy the required conditions of stationarity and ergodicity. Consequently, the correlation is moderate as compared to that which one obtains by using a more stationary radio parameter, i.e., the hourly medians of the received field. The nature of the used radio path, however, allows no definite conclusions to be drawn.